LM723JAN Voltage Regulator - N4IQT · PDF fileLM723JAN Voltage Regulator General Description The LM723 is a voltage regulator designed primarily for series regulator applications.
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LM723JANVoltage RegulatorGeneral DescriptionThe LM723 is a voltage regulator designed primarily forseries regulator applications. By itself, it will supply outputcurrents up to 150 mA; but external transistors can be addedto provide any desired load current. The circuit featuresextremely low standby current drain, and provision is madefor either linear or foldback current limiting.
The LM723 is also useful in a wide range of other applica-tions such as a shunt regulator, a current regulator or atemperature controller.
Featuresn 150 mA output current without external pass transistorn Output currents in excess of 10A possible by adding
external transistorsn Input voltage 40V maxn Output voltage adjustable from 2V to 37Vn Can be used as either a linear or a switching regulator
Ordering InformationNS PART NUMBER SMD PART NUMBER NS PACKAGE NUMBER PACKAGE DISCRIPTION
JL723BIA JM38510/10201BIA H10C 10LD Metal Can
JL723SCA JM38510/10201SCA J14A 14LD CERDIP
JL723SIA JM38510/10201SIA H10C 10LD Metal Can
Connection DiagramsDual-In-Line Package Metal Can Package
ISCD Standby Current Drain VIN = 30V, IL = IREF =0,VOUT = VREF
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Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device isfunctional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteedspecifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed testconditions.
Note 2: The maximum power dissipation for these devices must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature,TA. The maximum available power dissipation at any temperature is Pd = (TJMAX − TA)/θJA or the number given in the Absolute Maximum Ratings, whichever is less.See derating curves for maximum power rating above 25˚C.
Note 3: Human body model, 1.5 kΩ in series with 100 pF.
Note 4: L1 is 40 turns of No. 20 enameled copper wire wound on Ferroxcube P36/22-3B7 pot core or equivalent with 0.009 in. air gap.
Note 5: Figures in parentheses may be used if R1/R2 divider is placed on opposite input of error amp.
Note 6: Replace R1/R2 in figures with divider shown in Figure 13.
Note 7: V+ and VCC must be connected to a +3V or greater supply.
Note 8: For metal can applications where VZ is required, an external 6.2V zener diode should be connected in series with VOUT.
Note 9: Unless otherwise specified, TA = 25˚C, VIN = V+ = VC = 12V, V− = 0, VOUT = 5V, IL = 1 mA, RSC = 0, C1 = 100 pF, CREF = 0 and divider impedance as seenby error amplifier ≤ 10 kΩ connected as shown in Figure 1. Line and load regulation specifications are given for the condition of constant chip temperature.Temperature drifts must be taken into account separately for high dissipation conditions.
TABLE 2. Formulae for Intermediate Output VoltagesOutputs from +2 to +7 volts Outputs from +4 to +250 volts Current Limiting
(Figures 1, 4, 5, 6, 9, 12 ) (Figure 7)
Outputs from +7 to +37 volts Outputs from −6 to −250 volts Foldback Current Limiting
(Figures 2, 4, 5, 6, 9, 12) (Figures 3, 8, 10)
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Typical Applications
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for minimum temperature drift
Typical Performance
Regulated Output Voltage 5V
Line Regulation (∆VIN = 3V) 0.5mV
Load Regulation (∆IL = 50 mA) 1.5mV
FIGURE 1. Basic Low Voltage Regulator(VOUT = 2 to 7 Volts)
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for minimum temperature drift.
R3 may be eliminated for minimum component count.
Typical Performance
Regulated Output Voltage 15V
Line Regulation (∆VIN = 3V) 1.5 mV
Load Regulation (∆IL = 50 mA) 4.5 mV
FIGURE 2. Basic High Voltage Regulator(VOUT = 7 to 37 Volts)
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Typical Applications (Continued)
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Typical Performance
Regulated Output Voltage −15V
Line Regulation (∆VIN = 3V) 1 mV
Load Regulation (∆IL = 100 mA) 2 mV
FIGURE 3. Negative Voltage Regulator
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Typical Performance
Regulated Output Voltage +15V
Line Regulation (∆VIN = 3V) 1.5 mV
Load Regulation (∆IL = 1A) 15 mV
FIGURE 4. Positive Voltage Regulator(External NPN Pass Transistor)
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Typical Applications (Continued)
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Typical Performance
Regulated Output Voltage +5V
Line Regulation (∆VIN = 3V) 0.5 mV
Load Regulation (∆IL = 1A) 5 mV
FIGURE 5. Positive Voltage Regulator(External PNP Pass Transistor)
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Typical Performance
Regulated Output Voltage +5V
Line Regulation (∆VIN = 3V) 0.5 mV
Load Regulation (∆IL = 10 mA) 1 mV
Short Circuit Current 20 mA
FIGURE 6. Foldback Current Limiting
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Typical Applications (Continued)
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Typical Performance
Regulated Output Voltage +50V
Line Regulation (∆VIN = 20V) 15 mV
Load Regulation (∆IL = 50 mA) 20 mV
FIGURE 7. Positive Floating Regulator
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Typical Performance
Regulated Output Voltage −100V
Line Regulation (∆VIN = 20V) 30 mV
Load Regulation (∆IL = 100 mA) 20 mV
FIGURE 8. Negative Floating Regulator
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Typical Applications (Continued)
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Typical Performance
Regulated Output Voltage +5V
Line Regulation (∆VIN = 30V) 10 mV
Load Regulation (∆IL = 2A) 80 mV
FIGURE 9. Positive Switching Regulator(Note 4)
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Typical Applications (Continued)
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Typical Performance
Regulated Output Voltage −15V
Line Regulation (∆VIN = 20V) 8 mV
Load Regulation (∆IL = 2A) 6 mV
FIGURE 10. Negative Switching Regulator(Note 4)
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Note: Current limit transistor may be used for shutdown if current limiting is not required.
Typical Performance
Regulated Output Voltage +5V
Line Regulation (∆VIN = 3V) 0.5 mV
Load Regulation (∆IL = 50 mA) 1.5 mV
FIGURE 11. Remote Shutdown Regulator with Current Limiting
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Typical Applications (Continued)
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Regulated Output Voltage +5V
Line Regulation (∆VIN = 10V) 0.5 mV
Load Regulation (∆IL = 100 mA) 1.5 mV
FIGURE 12. Shunt Regulator
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FIGURE 13. Output Voltage Adjust(Note 6)
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Revision History SectionDateReleased Revision Section Originator Changes
02/15/05 A New Release, Corporate format L. Lytle 1 MDS data sheet converted into oneCorp. data sheet format. MJLM723-X,Rev. 1A0. MDS data sheet will bearchived.
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reservesthe right at any time without notice to change said circuitry and specifications.
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